Popularized by adventure, fantasy, and sci-fi literature, Hollow Earth theories advance the notion that Earth has a hollow interior and, possibly, a habitable inner surface. Although direct knowledge of Earth's structure extends only 15 m (24 km) down—the deepest humans have ever drilled—the Hollow Earth hypothesis has long been refuted by the modern understanding of planet formation. However, in ancient times, subterranean realms seemed plausible and became linked with what religious concepts?More...

Cinco de Mayo, the "Fifth of May," is a Mexican holiday that commemorates the Mexican army's unexpected victory over invading French troops at the Battle of Puebla. It is widely observed in Mexico and the US, particularly as a celebration of Mexican culture. However, it is distinct from Mexico's Independence Day, which is held annually on September 16 and commemorates Mexico's independence from Spanish rule in 1810. What became of the French after the Battle of Puebla?More...

Cochrane was a pioneering female journalist who wrote under the pseudonym Nellie Bly. She wrote investigative articles on topics such as the plight of female factory workers, and as a young woman worked as a foreign correspondent in Mexico. She later feigned insanity to gain access to an asylum and wrote an exposé that prompted much-needed reforms. In 1889, she circumnavigated the globe in 72 days, besting the fictional feat conceived by Jules Verne. What famous figure did she meet on the way?More...

Quotation of the Day

I dare say I am compelled, unconsciously compelled, now to write volume after volume, as in past years I was compelled to go to sea, voyage after voyage. Leaves must follow upon each other as leagues used to follow in the days gone by, on and on to the appointed end, which, being truth itself, is one—one for all men and for all occupations.

On May 5, 1950, King Bhumibol Adulyadej was crowned Rama IX of Thailand, the ninth king of the Chakri dynasty. Ever since, the day has been celebrated as Coronation Day in Thailand. On May 4th, the Chief of Brahmin priests reads out the official proclamation of Coronation Day. On May 5, the Buddhist monks are given a feast and the king wears his full regalia. At noon, the Royal Thai Army and Navy each give a 21-gun salute. Later in the day, the king awards medals and decorations to those citizens who have done outstanding services for the state.More...

Cassini, the little spacecraft that could, is going out in a blaze. For the next four months, the most sophisticated probe ever made will dance precariously between the Saturn and her icy rings, capturing spectacular images of this never-explored region. In this ...More...

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